ble_nus merged with multilink - How to send string to the correct peripheral?

[Philip]

Hi.

I have a project with usb_cdc merged with multilink_central and NUS service. It is working quite well, multiple peripherals can connect and send data to the central.

I am now sending data over ble from central to the peripherals using the following, but have no idea how to select the correct conn_handle i.e. which connected peripheral to send the data to?

Anyone know how I get a list of current connections, and use ble_nus_c_string_send() to send data to the correct peripheral?

Thanks

                ret_code_t ret_val;
                uint16_t data_len = 0;
                uint8_t testData[5];
                data_len = sprintf(testData, "hello");
                
                // Send data back to peripheral.
                do
                {
                    ret_val = ble_nus_c_string_send(&m_nus_c, testData, data_len);
                    if ((ret_val != NRF_SUCCESS) && (ret_val != NRF_ERROR_BUSY))
                    {
                        NRF_LOG_ERROR("Failed sending NUS message. Error 0x%x. ", ret_val);
                        APP_ERROR_CHECK(ret_val);
                    }
                } while (ret_val == NRF_ERROR_BUSY);

[Philip]

I think I may need to just add [i] to the end of &m_nus_c, there i = the handle number so

ret_val = ble_nus_c_string_send(&m_nus_c[i], testData, data_len);

[Jared]

Hi

m_nus_c is a pointer to a client structure of type ble_nus_c_t which contains a variable conn_handle which is the handle of the current connection. You can use m_nus_c[i] if you have already defined multiple instances with the BLE_NUS_C_ARRAY_DEF macro. 

You can find more information about the NUS service here

Jared